JENKINS-25607 Upgrade to BPP 1.4.4 breaks DPP
Merge pull request #86 from Diabol/JENKINS-25607_BPP_1_4_4_Upgrade

JENKINS-25607 Upgrade to BPP 1.4.4 breaks DPP
[maven-release-plugin] prepare release delivery-pipeline-plugin-0.8.7
[maven-release-plugin] prepare for next development iteration
JENKINS-25457 Server error when viewing pipeline with NOT_BUILT result job.
Merge pull request #87 from Diabol/JENKINS-25457_NOT_BUILT_result

JENKINS-25457 Server error when viewing pipeline with NOT_BUILT result
JENKINS-25744 Switch job property to use an optionalBlock

Normal convention for Jenkins plugins which contribute a JobProperty to a jobs
configuration page is to use an optionalBlock as the top level jelly tag.

In a jobs properties section of the configuration page, plugins 'hide' their
configuration entries by using the optionalBlock, this is presented to the user
as a checkbox. This keeps the jobs configuration page quite clean while allowing
the user full control over the properties they use.